EP0037834B1 - Verfahren zum kontrollieren der breite einer platte - Google Patents

Verfahren zum kontrollieren der breite einer platte Download PDF

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Publication number
EP0037834B1
EP0037834B1 EP79901378A EP79901378A EP0037834B1 EP 0037834 B1 EP0037834 B1 EP 0037834B1 EP 79901378 A EP79901378 A EP 79901378A EP 79901378 A EP79901378 A EP 79901378A EP 0037834 B1 EP0037834 B1 EP 0037834B1
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EP
European Patent Office
Prior art keywords
width
plate
rolled
amount
variation
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Expired
Application number
EP79901378A
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English (en)
French (fr)
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EP0037834A4 (de
EP0037834A1 (de
Inventor
Takashi Shibahara
Teruo Kohno
Yoshisuke Misaka
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Publication of EP0037834A1 publication Critical patent/EP0037834A1/de
Publication of EP0037834A4 publication Critical patent/EP0037834A4/de
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Publication of EP0037834B1 publication Critical patent/EP0037834B1/de
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Definitions

  • the present invention relates to width control of a rolled metal product produced by a hot strip mill and m6re particularly to a method for reducing or eliminating variation in width resulting from the hot rolling.
  • a hot rolling operation is carried out through a train of roughing rolls in which a plurality of vertical roll stands and a plurality of horizontal roll stands are arranged in series and alternately one after another. It has been the general practice in a rolling operation to set the roll gaps or the degrees of opening of the vertical roll stands at a desired roll opening prior to the feeding of the slab or material into the roll-stands, and such predetermined roll gaps are usually kept unchanged throughout the rolling operation for that material. Due to uneven distribution of temperatures or so-called skid marks in the slabs generated in the furnace, there is inevitably a possibility of variation in width of the rolled product such as strip and the like if such roll gaps are kept unchanged during the rolling operation.
  • the method of controlling the rolled product width according to the Japanese Patent Publication No. 26,503/1977 specification was on the assumption that such width variation would occur from the cause of uneven temperature distribution in the longitudinal direction of a slab to be rolled, and this led to adjusting the roll gap of the vertical rolls in accordance with the temperature variation existing in the longitudinal direction of the slabs or materials.
  • the well known prior methods of controlling the rolled strip widths along the entire longitudinal areas of the materials to be rolled are those disclosed in the Japanese Patent Publication No. 25,823/1976, the Japanese Patent Laid-Open Application No. 72,350/1977, the Japanese Patent Publication No. 24,907/1975, and the Japanese Patent Laid-Open Application No. 87,455/1976.
  • a slab or material is rolled by the vertical rolls in such a manner that the width spread in a material rolled therefrom will merely be relatively increased or decreased in inverse proportion to the width of a material to be rolled.
  • the method disclosed in the Japanese Patent Laid-Open Application No. 72,350/1977 is directed to the control of roll gap of the vertical rolls and is based on the assumption that the amount of width spread in a material obtained by the vertical rolling operation followed by the horizontal rolling operation is determined as a function of the longitudinal position (distance from the leading end) of the material, which comprises the steps of applying the thus-presumed relationship as a width spread factor to each combination of the thickness and the width of the material, and setting a pattern to be utilized for controlling the opening of the vertical rolls so as to control the above mentioned width spread according to the factor above.
  • 24,907/1975 is concerned with the control of the roll gap of the vertical rolls and is premised on the calculation based on the equation relative to the width spread of the material to be rolled which is determined solely in connection with the given rolling conditions, while the method disclosed in the Japanese Patent Laid-Open Application No. 87,455/1976 is also concerned with the provision of the gap control of the vertical rolls in consideration of the state of width spread of the material to be rolled which is likewise defined exclusively under the rolling conditions.
  • the present inventors carried out a series of field studies over a long period of time based on the actual profiles of rolled materials delivered from the vertical rolls, the extent of width variation of the rolled materials delivered from the horizontal rolls disposed immediately after that vertical rolls, and also upon the temperature distribution in the transverse or widthwise direction of the rolled materials.
  • skid-free areas there were some areas free from any effect of heat shielding produced by the skid arrangement in the furnace (hereinafter referred to as “skid-free areas”) and other areas which showed the effect of heat shielding by the skid arrangement (hereinafter referred to as "skidded areas”) existing alternately in the longitudinal direction of a slab fed from the furnace as stated hereinbefore, and it was proven that the principal of cause of such width variation in a rolled bar as mentioned hereinbefore is a substantial difference in the cross-sectional shape of the rolled material between the skidded areas and the skid-free areas thereof immediately after a vertical rolling operation.
  • the present invention is directed to a method according to claim 1.
  • the present invention shows the provision of an improved method for controlling the width variation of a rolled bar in which a necessary amount of width reduction by a vertical roll stand is calculated from the amount of bulging or elevation in thickness at the lateral margin of a material to be rolled in the widthwise or transverse direction thereof is different between the skidded areas and the skid-free areas of the material, whereupon the roll gap or opening of the vertical roll stand can be controlled properly.
  • the term “slab” is used for the raw material to be fed to a train of roughing rolls, the term “material” for the material undergoing the rolling operation and the term “bar” or "rolled bar” for the material delivered out of the train of roughing rolls.
  • Figure 1a is presented to show, in cross-section, a lateral margin of a material to be rolled at the entry side of the vertical rolls, Figure 1 showing the same section of the material rolled at the delivery side of the vertical rolls, and Figure 1c showing the same section of the material delivered from the horizontal rolls immediately after the vertical rolls.
  • Figure 1b the lateral margin of the material taken immediately after a vertical rolling operation exhibits a bulging or elevation in thickness of a dog-bone like shape in cross-section, regardless of its being a skidded area shown in broken line or its being skid-free area shown in solid line.
  • the lateral margin of the material having the skidded area is considered to exhibit remarkable bulging immediately after a vertical rolling operation for the following reason. That is, in a typical temperature distribution across the width of a material to be rolled, as shown in Figure 2, it is considered that the temperature of the middle area (A) across the width of a material is higher than that of the lateral marginal portions (B) thereof in the skid-free area (as shown in solid line), while the temperature of the middle area (A) is lower than that of the lateral marginal portions (B) in the skidded area (shown in broken line).
  • the middle area (A) of the material having the skidded area is not easily extended in the longitudinal direction (the rolling direction) thereof as the degree of restricting effect in this direction is high, and therefore, such bulging would be concentrated at the lateral marginal portions of the material at the time of a vertical rolling operation.
  • the present invention comprises the steps of measuring the width of a material to be rolled over at least the entire middle area thereof out of the entire longitudinal area thereof at the delivery side of any one of horizontal roll stands disposed in the middle of the train of roughing roll stands; determining respective local coefficients of width spread due to bulging at the lateral marginal portions for at least all the middle area out of the entire longitudinal area of the material to be rolled based on the values of the variation in width of the respective portions in the longitudinal direction which are derived from the measurement above, the degree of width reduction at each of the vertical roll stands upstream of the measuring point and a reference coefficient of width spread empirically determined by the rolling conditions; thereafter calculating a desired amount of modification of the opening in the vertical roll stand over at least the entire middle area of the material in order to have the value of width variation at the respective portions reduced substantially to zero at the end of the train of roughing roll stands on the basis of
  • skid-free area is a portion which is free from an effect of heat shielding due to the skid arrangement within the furnace
  • the temperature of such skid-free area is generally highest among any other portions of the slab.
  • the width of the rolled material will become narrowest at the portions corresponding to the skid-free areas over the entire middle area extending in the longitudinal direction of the material.
  • the skidded areas are subjected to the effect of the skid arrangement in the furnace, and therefore, are generally low in temperature in comparison with the skid-free areas thereby becoming substantially wide portions in the rolled material or bar.
  • the amount of width variation means a difference in width of the material between the skidded areas and the skid-free areas.
  • ⁇ V i represents the amount of width reduction at a skid-free area rendered by a vertical roll stand
  • ⁇ is a ratio of contribution to a bulging formation at the lateral marginal portions of a material (hereinafter referred merely to as "a bulging") to the amount of width reduction at the skid-free area.
  • the amount of width spread ⁇ B i contributed from the bulging at the skid-free area of the material observed at the "i-th" horizontal roll stand--that is the one immediately following the "i-th" vertical roll stand, is represented as follows; i.e., If a product of Y1 and Y2 is y, the above equation may be converted as follows; i.e., Now, let us call this y value the coefficient of width spread due to the bulging of the skid-free area.
  • the amount of width reduction at the skidded area rendered by the "i-th" vertical roll stand ⁇ V s is represented as follows; i.e., where, ⁇ W i-1 represents a difference in width of the material or an amount of width variation between the above mentioned skidded area and skid-free area at the delivery side of the "i-1 th" horizontal roll stand, and W E , represent an amount of width variation of the material at the delivery side of the "i-th" vertical roll stand.
  • amount of width spread ⁇ B si contributed from the bulging at the skidded area of the material at the delivery side of the "i-th" horizontal roll stand may be represented as follows; where, y s represents a coefficient of width spread due to the bulging at the skidded area.
  • y s represents a coefficient of width spread due to the bulging at the skidded area.
  • W Ei is defined to be positive in the case that the width of the material at the skidded area is greater than that of the material at the skid-free area.
  • the amount of width spread ⁇ B Si due to the bulging at the skidded area of the material at the delivery side of the "i-th" horizontal roll stand may be represented by the equation (2) above
  • the amount of width variation ⁇ W i observed at the delivery side of the "i-th" horizontal roll stand is represented by the following equation, i.e., The extent of width variation at the delivery side of the vertical roll stand is usually of a very small value, then the above mentioned extent of width variation ⁇ W i may be represented as follows;
  • the skid-free area is not affected by the skid, and therefore, the coefficient y of width spread due to the bulging is generally dependent empirically on such rolling conditions, in practice, as material dimensions (width and thickness), the temperature of the furnace, the kind of steel to be rolled, the pass schedule, etc.
  • the coefficient y s of width spread due to bulging at such affected areas may vary with the influence of such skid arrangement upon such areas.
  • the coefficient of width spread due to bulging at the skid-free area is referred to as “reference coefficient of width spread due to bulging”
  • the coefficient of width spread due to bulging at the respective skidded areas is called as “local coefficient of width spread due to respective bulging”
  • the local coefficient y s of width spread due to respective bulging may be obtained from a calculation. For instance, in the case a rolling reduction is modified at the "m-th" vertical roll stand by way of controlling a roll gap, the local coefficient y s of width spread due to respective bulging mentioned above is led from the calculation as follows.
  • the amount of width variation ⁇ W m-1 of the material at the delivery side of the "m-1 th" horizontal roll stand upstream of the abovementioned "m-th" vertical roll stand may be obtained from repeated application of the equation (4) above, as follows; i.e., where, ⁇ W o is the amount of width variation of the material before rolled (i.e., the slab), and therefore, ⁇ W o ⁇ 0, and then, the equation (5) above is now converted as follows; i.e.,
  • each of the amounts of width reduction AV m - 1 , ⁇ V m-2 , ... ⁇ V 1 and the reference coefficient y of width spread due to bulging are values empirically dependent on the rolling condition.
  • the amount of width variation ⁇ W m-1 of the material at the delivery side of the "m-1 th" horizontal roll stand is obtained from a field measurement, and consequently, the local coefficient y s of width spread due to respective bulging can be derived from well known repeated calculation on the basis of the equation (6) above.
  • the amount of width variation ⁇ W m of the material at the delivery side of the "m-th" horizontal roll stand i.e., the one immediately after the above mentioned vertical roll stand
  • ⁇ V m for ⁇ V 14 ⁇ W m-1 for ⁇ W i-1
  • ⁇ V m for ⁇ W Ei
  • the amount of width variation AW n of the material at the delivery side of the "n-th" horizontal roll stand i.e., the last one of the train of roughing roll stands may be represented by way of repeated application of the equation (4) above till the "m-th" one as follows; i.e., Therefore, substituting the value ⁇ W m in the equation (7) above into the equation (8) above, the amount of width variation ⁇ W n , of the material at the delivery side of the train of roughing roll stands with the rolling reduction being modified at the "m-th" vertical roll stand as mentioned above is now represented by the following equation; i.e.,
  • ⁇ V m the amount of width reduction to be increased, i.e., the amount of modified width at the "m-th" vertical roll stand which may reduce the amount of width variation ⁇ W n at the delivery side of the train of roughing roll stands to zero is then represented as follows; i.e.,
  • each of the amounts of width reduction AV n , ⁇ Vn-1,... ⁇ V m , at each of the "n, n-1,..., m-th" vertical roll stands, respectively, and the reference coefficient y of width spread due to bulging of the material are ones empirically dependent on the rolling conditions to be set, and on the other hand that the amount of width variation ⁇ W m-1 of the material at the "m-1 th" horizontal roll stand may be obtained from a field measurement, and if so obtained, the local coefficient y s of width spread due to respective bulgings may be derived from the equation (6) above.
  • the value ⁇ V m * to be applied for screwdown - - that is, the desired amount of roll gap change for the skidded area of the material - - is obtained from the following equation; i.e., where, Q represents a gradient of the plastic deformation curve, and K represents a rigidity coefficient of the "m-th" vertical roll stand. Also, AW EM represents the amount of width variation for the case that the "m-th" vertical roll stand is not modified with its rolling reduction, and usually, ⁇ Vm ⁇ W Em , so the above equation is now led as follows: i.e.,
  • the desired amount of modified rolling reduction may be derived from the equation (11) above.
  • the amount of width variation ⁇ W m+1 may be represented in the equation (12) as follows; i.e.,
  • the amount of width variation ⁇ W n of the material at the delivery side of the last one of the train of roughing roll stands, i.e., the "n-th" horizontal roll stand may be represented as follows; i.e.,
  • the equation (14) may then be as follows; i.e.,
  • the amount of width reduction AV n , ⁇ V n-1 , ... ⁇ V m ', and the reference coefficient y of width spread due to bulging are empirically dependent on the rolling conditions to be set, and that the amount of width variation AW at the delivery side of the "m-1 th" horizontal roll stand may be attained from a field measurement, and once this measurement value is obtained, the local coefficient ys of width spread due to bulging in this case may also be derived from the equation (6) above.
  • the necessary modification value to be applied in the opening of the vertical roll stand can be obtained for each of the portions, the skidded areas, of the material where the variation in width is expected. Accordingly, it will be foreseen that the width variation in the longitudinal direction of the rolled bar may be reduced substantially to zero by performing the calculation above for each of the portions of the material where such variation is to be expected.
  • the width of the skid-free portions is measured at the intermediate point after one of the horizontal roll stands in the train of roughing rolls and the mean value thereof is used as a reference width for calculating the width variation.
  • the present invention is essentially based on the principle heretofore explained. Generally, it is known that a plurality of skid-free areas exist in a single slab fed from the furnace. According to this invention, if and when the actual width of a portion is greater than the reference width stated above even at the skid-free areas, such portion shall be subjected to an application of increased width reduction. While all what is given herein is particularly concerned with the case in which increase of width reduction of a material is provided during the rolling operation, it is needless to mention that it is necessary to decrease the amount of width reduction in case the width of the material is less than the reference width at a certain portion thereof.
  • the amount of width variation at the longitudinal ends or at the leading end and/or the trailing end of a material to be rolled is greater than that at the longitudinal middle area thereof. It is, of course, possible to practice the method of the present invention at such portions - - i.e. the leading and trailing ends of the material. Incidentally, it is not necessarily intended that the present invention will be used for control over all of the longitudinal area of the material, but it is essential to control width variation at least over the middle area out of the entire longitudinal area of such material.
  • the width measurement of the material undergoing rolling operation through the train of roughing roll stands may be conducted at delivery side of any of the horizontal roll stands except for the first and last horizontal roll stands in the train.
  • a pulse generator 4 attached on the stand R 3 functions to measure the number of revolutions of the rolls from the moment of engagement of the material 1.
  • a width gauge 2 disposed at the delivery side of the stand R 3 measures continuously the width of the material 1 at the delivery side thereof.
  • an operation and memory unit 5 Upon receipt of signals 2a, 3a, and 4a from such width gauge 2, load cell 3 and pulse generator 4, respectively, an operation and memory unit 5 function to recognize the longitudinal position of a point of width measurement on the material 1 and also operate amounts of width variation at respective points, and then the thus-obtained values of width variations are given in correspondence to the longitudinal position of the material 1, whereby a distribution of width variation values in the longitudinal direction of the material 1 is now operated and so stored.
  • a pass schedule operation unit 7 operates, upon the entry of such input signals representing a thickness and a width of a slab before being rolled by the train of roughing roll stands, a desired thickness and a desired width of a rolled bar at the delivery side of the train of roughing roll stands, as well as such rolling factors as a coefficient of mill rigidity of each stand and a maximum output of each mill drive motor, to attain a pass schedule for the entire roll train.
  • the results 7a of this operation and a signal 5a received from the unit 5 representing distribution of width variation are fed to an operation unit 6, the unit 6 operates the local coefficient y s of width spread due to respective bulging.
  • a roll opening control unit 9 disposed at the stand E 4 operates, upon receipt of an output 8a from the operation unit 8 and a signal 5b representing distribution of width variation from the operation and memory unit 5, to obtain the roll opening control value required for the modification of width reduction.
  • This unit 9 then recognizes the current rolling position of the material 1 from the relationship with the longitudinal position thereof by way of signals 11 a and 12a from the load cell 11 and the pulse generator 12, respectively of the stand E 4 , and determining an amount of control required at that rolling position as a signal 9a and feeds the signal 9a to a screw-down unit 10. In accordance with such signal the unit 10 sends a screwdown signal 10a to the stand E 4 thereby controlling the roll opening at that stand.
  • the measure value of width variation AW 3 between a point which represents a typical skidded area and a point representing a typical skid-free area of the material at the delivery side of the stand R 3 was 5.2 mm.
  • the local coefficient y s of width spread due to respective bulging was 0.77.
  • the reference coefficient y of width spread due to bulging was 0.70 from the field data available.
  • the present invention in order to attain substantially no width variation of the rolled bar at the delivery side of the train of roughing roll stands, it is noted that there should be provided a modification in width reduction such that the width of the material at the skidded area is made narrower than that at the skid-free area.
  • the amount of increased width reduction Ilv m turned out to be 9.7 mm, and the value I1v m * to be applied for screwdown was 10.9 mm at the stand E 4 .
  • Figures 6a, b and c the results of filed measurement and calculation of such width variation existing over the longitudinal areas of the material.
  • Figure 6a shows the amount of width variation measured by the width gauge disposed at the delivery side of the stand R 3
  • a broken line in Figure 6c shows the measurement of width variation of the material processed by the conventional method at the delivery side of the train of roughing roll stands wherein no modification was effected at the stand E 4 .
  • the present invention provides a markedly advantageous method of controlling or minimizing width variation of rolled bar.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (1)

  1. Verfahren zur Steuerung der Materialbreite beim Warmbandwalzen auf einer Straße von Vorwalzgerüsten, bei welcher eine Anzahl von vertikalen Walzgerüsten und eine Anzahl von horizontalen Walzgerüsten hintereinander und abwechselnd angeordnet sind, wobei das Verfahren die Verfahrensschritte des Messens der Breite eines zu walzenden Materials über wenigstens den gesamten Mittelbereich aus dem gesamten Längsbereich desselben an der Abgabeseite irgendeines der zwischen den Enden der Straße aus Vorwalzgerüsten angeordneten horizontalen Walzgerüste; des Bestimmens betreffender lokaler Koeffizienten einer auf Ausbauchung an den seitlichen Randbereichen zurückgehenden Breitenausweitung für wenigstens den gesamten Mittelbereich aus dem gesamten Längsbereich des zu walzenden Materials auf der Grundlage der Breitenänderungswerte der betreffenden Abschnitte in Längsrichtung, welche aus obiger Messung hergeleitet werden, wobei der Grad der Breitenverminderung an jedem der vertikalen Walzgerüste vor der Meßstelle und ein Bezugskoeffizient der Breitenausweitung durch die Walzbedingungen empirisch bestimmt werden; des nachfolgenden Berechnens des erforderlichen Änderungsbetrags, der für die Anstellung über wenigstens den gesamten Mittelbereich des Materials anzubringen ist, um die nach der Meßstelle erwartete Breitenschwankung der Abschnitte des Materials auf null zu reduzieren, auf der Grundlage des lokalen Koeffizienten der auf die betreffenden Ausbauchungen zurückgehenden Breitenausweitung, wobei der Betrag der Breitenverminderung an jedem der vertikalen Walzgerüste, die nach dem vertikalen Walzgerüst angeordnet sind, wo dessen Öffnung zu steuern ist, der Bezugskoeffizient der auf die Ausbauchung zurückgehenden Breitenausweitung und die Werte für die Breitenschwankung wie oben an den betreffenden Abschnitten hergeleitet werden; und des Steuerns der Öffnung wenigstens eines der nach der Meßstelle angeordneten vertikalen Walzgerüste, so daß der erforderliche Änderungsbetrag für die Anstellung über wenigstens den gesamten Mittelbereich aus dem Gesamtbereich des zu walzenden Materials angebracht wird, umfaßt.
EP79901378A 1979-10-19 1981-05-04 Verfahren zum kontrollieren der breite einer platte Expired EP0037834B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1979/000264 WO1981001114A1 (en) 1979-10-19 1979-10-19 Method of controlling width of plate

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EP0037834A1 EP0037834A1 (de) 1981-10-21
EP0037834A4 EP0037834A4 (de) 1983-10-04
EP0037834B1 true EP0037834B1 (de) 1985-06-12

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DE (1) DE2953607A1 (de)
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JPS60255209A (ja) * 1984-05-30 1985-12-16 Mitsubishi Heavy Ind Ltd 圧延機におけるエツジヤ開度制御方法
CN102716913B (zh) * 2012-06-26 2014-08-27 山西太钢不锈钢股份有限公司 铁素体热轧不锈钢楔形板坯宽度控制方法
CN103831304B (zh) * 2012-11-23 2016-03-02 攀钢集团攀枝花钢钒有限公司 一种热连轧中间坯目标宽度计算方法及系统
CN103252354B (zh) * 2013-05-17 2015-05-06 山西太钢不锈钢股份有限公司 一种热轧不锈钢带边部侧翻的控制方法
CN113909297B (zh) * 2021-10-12 2022-10-11 福建三宝特钢有限公司 超薄耐腐蚀热轧带钢轧制成型方法
CN114798754B (zh) * 2022-03-10 2024-06-28 唐山钢铁集团有限责任公司 一种热轧带钢宽度补偿控制方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5236543A (en) * 1975-09-19 1977-03-19 Hitachi Ltd Controll device for stentering roll mill
JPS5226503B2 (de) * 1973-05-16 1977-07-14

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Publication number Priority date Publication date Assignee Title
DE69220126T2 (de) * 1991-03-29 1997-12-04 Philips Electronics Nv Ladungsgekoppelte Anordnung
JPH05236543A (ja) * 1992-02-25 1993-09-10 Oki Electric Ind Co Ltd 宅内通信制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5226503B2 (de) * 1973-05-16 1977-07-14
JPS5236543A (en) * 1975-09-19 1977-03-19 Hitachi Ltd Controll device for stentering roll mill

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 3, no. 123, October 16, 1979, page 17C61 *

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GB2072557B (en) 1983-02-09
WO1981001114A1 (en) 1981-04-30
EP0037834A4 (de) 1983-10-04
EP0037834A1 (de) 1981-10-21
DE2953607A1 (de) 1982-01-28
GB2072557A (en) 1981-10-07

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